The absolute simplest way you could do this is with something like Thrive Content Builder - http://bit.ly/20Rnhn8 - and their templating system. I actually have a content site that I run that makes decent use of these image list type of posts.

Creating the base template is pretty simple - I just created a template once for posts of this type and whenever I want to create a new image list post, all I have to do is load that template up and fill in the images, sources, and content.

Hope that helps!